No beta version installed ever. First I installed the game from Steam on the Mac. I was asked for serial key input once I started the game. The serial input field is not in Steam but shows once the game starts. Its is part of the games UI. Next I deleted the game files in Steam and installed manuall...

Hi, I bought the game on Steam for my PC and now I installed it on my Macbook as well. Once installed, the game asks for a serial key at the start screen. Is it allowed to use one key both on Mac and PC and where do I find this key? I searched on Steam in the games links and in properties for it but...